jisco_winform_wzjl/Common/utils/CarNoUtil.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Common.utils
{
    public class CarNoUtil
    {
        public static string CarNoChange(String carNo)
        {
            return carNo.Substring(0, 2) + "-" + carNo.Substring(2);
        }
    }
}